J. MURRAY ON GASTROTRICHA . 227 



to the furca, springing from the papillae. Fnrca longish, widely 

 divergent, obtuse pointed. 



Habitat. Praca Republica, Rio de Janeiro. The original larus 

 is probably not now recognisable, but modern authors have 

 defined it as an animal with scales as in fig. 9, and about eleven 

 longitudinal rows of them. This has more numerous rows. As 

 far as can be judged from the description without a figure, this 

 species is very like C. laroides Marco., but that is said to have the 

 scales truncate posteriorly. 



It is to be noticed that these very destinctive scales are quite 

 invisible in living or well-preserved specimens. I have only 

 managed to see them in empty, partly shrivelled skins. 



Chaetonotus sp. (PI. 19, fig. 34). 



Of moderate size. Head obscurely 3-lobed, with large cephalic 

 shield. Body covered with long, widely out-curved bristles, all 

 barbed, in few rows (six seen in dorsal view) springing from 

 obscure but large hemispherical scales. Close to the furca nine 

 very long, recurved, barbed bristles, three dorsal, six lateral. 

 Branches of furca long, separated by sulcus at base, outcurved, 

 knobbed. 



Habitat. Sydney and New Zealand ; a very similar form in 

 Rio, Brazil. 



The most obvious character is the widely spreading bristles. 

 Even those nearest the cephalic shield are long, but they are 

 progressively longer posteriorly till near the furca, when a few 

 quite short bristles intervene between the longest dorsal bristles 

 and the special large ones at the furca. 



Chaetonotus sp. (PI. 19, fig. 35). 



Of moderate size, relatively broad and squat. Head rounded, 

 5-lobed. Neck well-marked, short. Trunk parallel-sided. Body 

 covered with apparently rhomboid scales, each bearing a short 

 spine or scale. Furca short, diverging, then converging (enclosing 

 a rhomboid space), the basal portion scaly, the apical portion 

 smooth. There are long tactile setae on the head. 



The general form is like that of Ichthydium ocellatum Met. 

 [Lepidodei'ma ocellatum Zel.). I saw nothing like the eye-spots 

 ascribed to both those animals. 



